Hi there, i took the ipod dock out of my a3 (2009) glove box and swapped it for cd changer as i had a aux lead by the 12v socket, i then went to install the ipod dock in my mums audi tt (2007) there was no original interface in the glove box so i took the slot out the dash board and there was no lead to plug into the ipod dock, is this lead hidden? am i being stupid? and if i need a lead what lead and were is it wired/plugged in?